# CVE-2026-81431: Registration Form for WooCommerce 1.1.0 - 1.1.2 - Contributor+ Privilege Escalation via Unvalidated tgwcfb_id

> Contributors can escalate privileges to Administrator by exploiting unvalidated form IDs during registration, leading to full site takeover.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-rg35-vr3j-6cfx

## What is CVE-2026-81431?

CVE-2026-81431 is a high-severity vulnerability in Unknown Registration Form for WooCommerce, published on 10 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The Registration Form for WooCommerce WordPress plugin before 1.1.3 does not validate that the form referenced during registration is a legitimate registration form, reading the permitted-role allow-list from an arbitrary attacker-controlled post instead. A user able to create a post (Contributor and above) can therefore register a new account with an arbitrary role, including Administrator, leading to full site takeover. This is an incomplete fix of CVE-2026-54807.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-81431?


## How do I fix CVE-2026-81431?

No fix has been published for CVE-2026-81431 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-81431 being exploited?

There is no known exploitation of CVE-2026-81431 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81431 and fix it if it is affected.

What it is: CVE-2026-81431 is a high-severity vulnerability in Unknown Registration Form for WooCommerce, published on 10 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-81431 in the wild and no public exploit code.

Affected product: Unknown Registration Form for WooCommerce. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-81431/ (Markdown: https://insights.sbomify.com/CVE-2026-81431/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81431
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81431
- OSV: https://osv.dev/vulnerability/CVE-2026-81431

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81431/
Summaries are generated and may contain mistakes; the official description above is the record.